This patch adds accelerometer iio driver which uses sensorhub as data
provider.

Signed-off-by: Karol Wrona <k.wr...@samsung.com>
Acked-by: Kyungmin Park <kyungmin.p...@samsung.com>
---
 drivers/iio/accel/Makefile           |    2 +
 drivers/iio/accel/ssp_accel_sensor.c |  240 ++++++++++++++++++++++++++++++++++
 2 files changed, 242 insertions(+)
 create mode 100644 drivers/iio/accel/ssp_accel_sensor.c

diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
index a593996..2ab1ca6 100644
--- a/drivers/iio/accel/Makefile
+++ b/drivers/iio/accel/Makefile
@@ -16,3 +16,5 @@ st_accel-$(CONFIG_IIO_BUFFER) += st_accel_buffer.o
 
 obj-$(CONFIG_IIO_ST_ACCEL_I2C_3AXIS) += st_accel_i2c.o
 obj-$(CONFIG_IIO_ST_ACCEL_SPI_3AXIS) += st_accel_spi.o
+
+obj-$(CONFIG_SSP_SENSOR_IIO) += ssp_accel_sensor.o
diff --git a/drivers/iio/accel/ssp_accel_sensor.c 
b/drivers/iio/accel/ssp_accel_sensor.c
new file mode 100644
index 0000000..5e7d3e0
--- /dev/null
+++ b/drivers/iio/accel/ssp_accel_sensor.c
@@ -0,0 +1,240 @@
+/*
+ *  Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ */
+
+#include <linux/platform_device.h>
+#include <linux/stat.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/common/ssp_sensors.h>
+#include <linux/iio/kfifo_buf.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/common/ssp_sensors.h>
+#include "../common/ssp_sensors/ssp_iio_sensor.h"
+
+#define CHANNEL_COUNT 3
+
+#define SSP_ACCEL_NAME "ssp-accelrometer"
+static const char ssp_accel_device_name[] = SSP_ACCEL_NAME;
+
+enum accel_3d_channel {
+       CHANNEL_SCAN_INDEX_X,
+       CHANNEL_SCAN_INDEX_Y,
+       CHANNEL_SCAN_INDEX_Z,
+       CHANNEL_SCAN_INDEX_TIME,
+       ACCEL_3D_CHANNEL_MAX,
+};
+
+struct ssp_accel_state {
+       int accel_val;
+       int accel_calibbias;
+       struct ssp_data *data;
+       short calibration_data[CHANNEL_COUNT];
+};
+
+static struct ssp_accel_state accel_state;
+
+static int accel_read_raw(struct iio_dev *indio_dev,
+                         struct iio_chan_spec const *chan,
+                         int *val,
+                         int *val2,
+                         long mask)
+{
+       int ret;
+       u32 t;
+       struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
+
+       switch (mask) {
+       case IIO_CHAN_INFO_SAMP_FREQ:
+               t = ssp_get_sensor_delay(data, SSP_ACCELEROMETER_SENSOR);
+               ssp_convert_to_freq(t, val, val2);
+               ret = IIO_VAL_INT_PLUS_MICRO;
+               break;
+       default:
+               ret = -EINVAL;
+               break;
+       }
+
+       return ret;
+}
+
+static int accel_write_raw(struct iio_dev *indio_dev,
+                          struct iio_chan_spec const *chan,
+                          int val,
+                          int val2,
+                          long mask)
+{
+       int ret, value;
+       struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
+
+       switch (mask) {
+       case IIO_CHAN_INFO_SAMP_FREQ:
+               value = ssp_convert_to_time(val, val2);
+               ret = ssp_change_delay(data, SSP_ACCELEROMETER_SENSOR, value);
+               if (ret < 0) {
+                       dev_err(&indio_dev->dev, "accel sensor enable fail\n");
+                       ret = -EINVAL;
+               }
+               break;
+       default:
+               ret = -EINVAL;
+               break;
+       }
+
+       return ret;
+}
+
+static int accel_write_raw_get_fmt(struct iio_dev *indio_dev,
+                              struct iio_chan_spec const *chan,
+                              long mask)
+{
+       return IIO_VAL_INT_PLUS_MICRO;
+}
+
+static struct iio_info ssp_accel_iio_info = {
+       .read_raw = &accel_read_raw,
+       .write_raw = &accel_write_raw,
+       .write_raw_get_fmt = &accel_write_raw_get_fmt,
+};
+
+static const struct iio_chan_spec acc_channels[] = {
+       SSP_CHANNEL_AG(IIO_ACCEL, IIO_MOD_X, CHANNEL_SCAN_INDEX_X),
+       SSP_CHANNEL_AG(IIO_ACCEL, IIO_MOD_Y, CHANNEL_SCAN_INDEX_Y),
+       SSP_CHANNEL_AG(IIO_ACCEL, IIO_MOD_Z, CHANNEL_SCAN_INDEX_Z),
+       IIO_CHAN_SOFT_TIMESTAMP(CHANNEL_SCAN_INDEX_TIME),
+};
+
+int accel_open_calibration(struct ssp_data *data)
+{
+       return 0;
+}
+
+static int process_accel_data(struct iio_dev *indio_dev, void *buf,
+                             s64 timestamp)
+{
+       __le64 time = 0;
+       u8 data[16] = {0};
+       const int len = SSP_ACCELEROMETER_SIZE;
+
+       if (indio_dev->scan_bytes == 0)
+               return indio_dev->scan_bytes;
+
+       memcpy(data, buf, SSP_ACCELEROMETER_SIZE);
+
+       if (indio_dev->scan_timestamp) {
+               memcpy(&time, &((char *)(buf))[len], SSP_TIME_SIZE);
+               *(s64 *)((u8 *)data +  ALIGN(len, sizeof(s64))) =
+                       timestamp + le64_to_cpu(time) * 1000000;
+       }
+
+       iio_push_to_buffers(indio_dev, (u8 *)data);
+
+       return indio_dev->scan_bytes;
+}
+
+static int ssp_accel_remove(struct platform_device *pdev)
+{
+       struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+
+       ssp_common_destroy_sensor(indio_dev);
+
+       return 0;
+}
+
+static int ssp_accel_probe(struct platform_device *pdev)
+{
+       int ret = 0;
+       struct iio_dev *indio_dev;
+       struct ssp_sensor_data  *spd;
+
+       indio_dev = iio_device_alloc(sizeof(*spd));
+       if (IS_ERR(indio_dev)) {
+               dev_err(&pdev->dev, "device alloc fail\n");
+               return PTR_ERR(indio_dev);
+       }
+
+       spd = iio_priv(indio_dev);
+
+       spd->process_data = process_accel_data;
+       spd->prv_data = &accel_state;
+       spd->type = SSP_ACCELEROMETER_SENSOR;
+
+       indio_dev->name = ssp_accel_device_name;
+       indio_dev->dev.parent = &pdev->dev;
+       indio_dev->dev.of_node = pdev->dev.of_node;
+       indio_dev->info = &ssp_accel_iio_info;
+
+       if (indio_dev->info == NULL)
+               goto err_iio_alloc;
+
+       indio_dev->modes = INDIO_DIRECT_MODE;
+       indio_dev->channels = acc_channels;
+       indio_dev->num_channels = ARRAY_SIZE(acc_channels);
+
+       ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
+                                        NULL, NULL);
+       if (ret < 0) {
+               dev_err(&pdev->dev, "Triggered buffer setup fail\n");
+               goto err_iio_alloc;
+       }
+
+       ret = ssp_sensor_setup_trigger(indio_dev, ssp_accel_device_name, spd);
+       if (ret < 0) {
+               dev_err(&indio_dev->dev, "Trigger setup fail\n");
+               goto err_iio_tbuffer;
+       }
+
+       ret = iio_device_register(indio_dev);
+       if (ret < 0)
+               goto err_ssp_trigger;
+
+       platform_set_drvdata(pdev, indio_dev);
+
+       ssp_register_consumer(indio_dev, SSP_ACCELEROMETER_SENSOR);
+
+       return 0;
+
+err_ssp_trigger:
+       ssp_sensor_remove_trigger(indio_dev);
+err_iio_tbuffer:
+       iio_triggered_buffer_cleanup(indio_dev);
+err_iio_alloc:
+       iio_device_free(indio_dev);
+
+       return ret;
+}
+
+static const struct of_device_id ssp_accel_id_table[] = {
+       {
+               .compatible = "samsung,mpu6500-accel",
+       },
+       {},
+};
+
+static struct platform_driver ssp_accel_driver = {
+       .driver = {
+               .owner = THIS_MODULE,
+               .name = SSP_ACCEL_NAME,
+               .of_match_table = ssp_accel_id_table,
+       },
+       .probe = ssp_accel_probe,
+       .remove =  ssp_accel_remove,
+};
+
+module_platform_driver(ssp_accel_driver);
+
+MODULE_AUTHOR("Karol Wrona <k.wwr...@samsung.com>");
+MODULE_DESCRIPTION("Samsung sensorhub accelerometers driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

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